[display unit of an active-matrix organic light emitting display]

Abstract

A display unit of an active-matrix organic light emitting display is provided. The display unit includes a first transistor, a second transistor, and an organic light emitting diode. The display unit uses a P-type LTPS-TFT having a lower threshold voltage to reduce the operational Vgs. Therefore, the second transistor can provide the stable drain current for the organic light emitting diode. The organic light emitting diode can thus maintain its brightness for a longer period of time.

1 . A display unit of an active-matrix organic light emitting display, comprising: 
 a first transistor, having a gate for receiving a first driving signal, said first transistor determining whether or not to conduct a second signal based on said first driving signal;    a second transistor, having a gate for receiving said second signal, said second transistor determining whether or not to conduct a power source based on said second signal; and    an organic light emitting diode, receiving said power source to emit a light;    wherein said second transistor is a P-type transistor having a threshold voltage, and an absolute value of said threshold voltage of said second transistor is between 2V to 5V.    
   
   
       2 . The display unit of  claim 1 , wherein the absolute value of said threshold voltage of said second transistor is between 2.5V to 3.5V.  
   
   
       3 . The display unit of  claim 1 , wherein said first transistor is a P-type transistor having a threshold voltage, and the absolute value of said threshold voltage of said first transistor is between 2V to 5V.  
   
   
       4 . The display unit of  claim 3 , wherein the absolute value of said threshold voltage of said first transistor is between 2.5V to 3.5V.